The cross correlation of two real finite energy sequences x(n) and y(

1.	The cross correlation of two real finite energy sequences x(n) and y(n) is given as __________
A.	$r_{xy}(l)=\sum_{n=-\infty}^{\infty}x(n)y(n-l)$ where l=0,±1,±2,…
B.	$r_{xy}(l)=\sum_{n=0}^{\infty}x(n)y(n-l)$ where l=0,±1,±2,…
C.	$r_{xy}(l)=\sum_{n=-\infty}^{\infty}x(n)y(n-l)$ where -∞<l<∞
D.	none of the mentioned
Answer» B. $r_{xy}(l)=\sum_{n=0}^{\infty}x(n)y(n-l)$ where l=0,±1,±2,…

Discussion

1.	The cross correlation of two real finite energy sequences x(n) and y(n) is given as __________
A.	\(r_{xy}(l)=\sum_{n=-\infty}^{\infty}x(n)y(n-l)\) where l=0,±1,±2,…
B.	\(r_{xy}(l)=\sum_{n=0}^{\infty}x(n)y(n-l)\) where l=0,±1,±2,…
C.	\(r_{xy}(l)=\sum_{n=-\infty}^{\infty}x(n)y(n-l)\) where -∞<l<∞
D.	none of the mentioned
Answer» B. \(r_{xy}(l)=\sum_{n=0}^{\infty}x(n)y(n-l)\) where l=0,±1,±2,…